CVE-2025-59248

Microsoft Exchange Server Spoofing Vulnerability

CVE-2025-59248 is fixed in 4 products on 1 platform, first by KB5066369, released October 14, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0102

63rd percentile

<p>Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5066369	Oct 14, 2025
Microsoft Exchange Server 2019 Cumulative Update 14	KB5066368	Oct 14, 2025
Microsoft Exchange Server 2019 Cumulative Update 15	KB5066367	Oct 14, 2025
Microsoft Exchange Server Subscription Edition RTM	KB5066366	Oct 14, 2025

Details

Published
October 14, 2025
Weakness
Improper Input Validation
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59248

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